Exhaust System

Abstract

An exhaust system for a plurality of turbines. An exhaust gas outlet is positioned on each of the plurality of turbines. The exhaust gas outlet provides a way of discharging any exhaust gas produced by a turbine during operation of the turbine. A common exhaust is operatively connected to the exhaust gas outlet of each of the plurality of turbines. The common exhaust is disposed to receive any exhaust gas produced by the plurality of turbines during the operation of at least one of the turbines. A back flow damper is positioned on the exhaust gas outlet for each of the plurality of turbines. An isolation damper is disposed on the back flow damper. The isolation damper is in fluid communication with the common exhaust.

1 . An exhaust system for a plurality of turbines comprising:
 an exhaust gas outlet positioned on each of the plurality of turbines, the exhaust gas outlet providing a way of discharging any exhaust gas produced by a turbine during operation of the turbine;   a common exhaust operatively connected to the exhaust gas outlet of each of the plurality of turbines, the common exhaust disposed to receive any exhaust gas produced by the plurality of turbines during the operation of at least one of the turbines;   a back flow damper position on the exhaust gas outlet for each of the plurality of turbines, the back flow damper allowing exhaust gas to exit the turbine and preventing fluids in the common exhaust from entering the turbine;   an isolation damper disposed on the back flow damper, the isolation damper being in fluid communication with the common exhaust, the isolation damper being operable to control fluid flow between the back flow damper and the common exhaust; and   a drain positioned adjacent the isolation damper to drain any fluid that maybe present.   
     
     
         2 . An exhaust system of  claim 1  wherein a conduit is connected to the isolation damper and a valve is positioned in the conduit to control the flow of fluid through the conduit. 
     
     
         3 . The exhaust system of  claim 2  wherein the conduit is open to the atmosphere and the valve can be opened to exhaust any fluids from the common exhaust that are present in the isolation damper. 
     
     
         4 . The exhaust system of  claim 2  wherein a source of pressurized fluid is connected to the conduit whereby the valve can be opened to admit pressurized fluid to isolation damper to pressurize the isolation damper and back flow damper to a pressure greater than the pressure in the common exhaust.